Boku dake ga inai machi (Erased) - 僕 だ け が い な い 街

Satoru Fujinuma is a manga artist who can't seem to get his career off the ground.
He is a very reserved boy who has trouble opening up to others. Satoru has the gift of seeing accidents and go back in time to avoid them.

One day he suffers a big trauma which takes him back in time to his childhood, in elementary school.

He will then try prevent the murder of children that had taken place at the time.